October 31 Deadline for Legacy Microsoft Office Connecting to Exchange Online

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A while back Microsoft announced a change that would deprecate RPC over http from Exchange Online in favor of the more modern MAPI over http. It’s officially happening October 31, and as we get closer to the deadline we want to remind clients that this will affect anyone connecting to Exchange Online with legacy Office 2010 or Office 2013. In order to leverage MAPI over http, your Office implementation must be one of the following build versions:

That said, patches for all Office versions were released in December 2015 in order to convert from RPC to MAPI. With that much lead time, few of our clients should be affected. Be sure, however, that everything is patched accordingly if you are still using these versions of Office with Exchange Online.

This support article will help you determine what version of Office you are running.